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Failed to convert virtual machine

I'm trying to convert a Windows server 2012r2 server running on ESXi 5.1 to Hyper-V. I started out using the MS virtual machine converter, but it doesn't seem to support UEFI machines. I found this 5NINE's tool, which seems good I have been able to convert a couple of machines, but now I have one that I just can't convert. I get a message:

"failed to convert virtual machine 'hostname'. Failed to provision a new virtual machine. I end up with a ~25GB vhdx, the source machine has a 40GB HDD. I believe part of the problem is that the conversion wizard has Generation 1 auto selected, and greyed out. I can't change it to Gen 2. The source VM has SCSI disk and EFI 'bios', so I know Gen 1 Hyper V machine won't work. Why will this tool not allow me to select Gen 2? I tried other VMs, same source host, all deployed from same base template, and they show up as Gen 2. I can't figure this out and really don't want to have to rebuild this machine

Thanks for the reply - I wish it was that easy, but no, it's not FAT32. I was really hoping someone from the 5Nine team could chime in on this one, I'm out of ideas and have given up on this tool for now, which is a shame as it was able to convert some UEFI VMs that the MS virtual machine converter was unable to

Please ensure, that you have x2 VM size space available on a destination Hyper-V host.
It would also help, if you could launch 5nine V2V Easy Converter as Administrator on a destination Hyper-V host directly.